Win XP Install on New Optiplex GX620

OK. I'm gobsmacked on this one. Setting up 2 new workstations fresh from Dell with Win XP preinstalled. On power up the setup routine runs normally. When first asked for a password for the Administartor account, password is left empty. At login screen after the first reboot, Windows will not accept the blank entry for the Administrator password. Any ideas on this one folks? If I have to whip out the reinstall CD's OK. But I'd rather not.System Information:

Sorry. What I mean is that the OS has been pre-loaded on the workstations with Microsoft Windows XP OEM Preinstallation Kit. At the Windows setup prompt for an administrator password, the password was left blank. At logon after the first reboot, it will not take the blank password. At this point, Windows has not been completely installed/setup. Hope I am being clear. My wife says she can't understand what I'm talking about half the time anyway!

I once had a science teacher that said the only stupid questions were the ones that didn't get asked. To answer your question, the boxes will be added to an SBS2003 Domain (Small Business Server 2003) after Windows setup is completed using the SBS Network connection tool via IE from the client machine. And as for the thick skulled, no neck admin, I'm him. So, no I didn't set a password.